Analyses of the Diesel Combustion Process Based on Varying Delay Mechanism : First Report, Theoretical Model and Its Verification

概要

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As has been clarified earlier in previous papers, the theoretical description of the initial process of combustion in a diesel engine may be well performed by introducing the varying-delay concept. In the present study, this theory is modified in two points in order to permit simpler prediction and wider applications. One is to determine the evaporation rate of fuel spray empirically by the measured peak cylinder pressure, and the other is to assume the existence of an unburned zone in which any heat release does not take place. The result of analysis performed for a direct-injection engine shows that the rate of heat release versus time relations are reasonably reproduced once the ignition delay is assumed to be subject to local temperature of burning zone having proper dimensions, instead of adopting spatially averaged temperature. Further, some discussions are made to clarify the effects of injection timing and of gas expansion due to piston displacement, together with a tentative explanation of misfiring.
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